Set empty string in TextBox if Database value is null in ASP.Net

Hi sambath,

Please refer below sample.

HTML

<div>
    Date:
    <asp:TextBox ID="txtDate" runat="server"></asp:TextBox>
</div>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

Vb.Net

Imports System.Data.SqlClient
Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("select convert(varchar,BirthDate,101) AS BirthDate FROM Employees", con))
        {
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                DataTable dt = new DataTable();
                da.Fill(dt);
                if (dt.Rows[0]["BirthDate"] == DBNull.Value || dt.Rows[0]["BirthDate"].ToString() == "01/01/1900")
                {
                    txtDate.Text = "";
                }
                else
                {
                    txtDate.Text = dt.Rows[0]["BirthDate"].ToString();
                }
            }
        }
    }
}

Vb.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand("select convert(varchar,BirthDate,101) AS BirthDate FROM Employees", con)
            Using da As SqlDataAdapter = New SqlDataAdapter(cmd)
                Dim dt As DataTable = New DataTable()
                da.Fill(dt)
                If dt.Rows(0)("BirthDate") Is DBNull.Value OrElse dt.Rows(0)("BirthDate").ToString() = "01/01/1900" Then
                    txtDate.Text = ""
                Else
                    txtDate.Text = dt.Rows(0)("BirthDate").ToString()
                End If
            End Using
        End Using
    End Using
End Sub

Screenshot